Monoazo dyestuffs and process of making same.



UNITED STATES PATENT OFFICE.

HERMANN WAGNER, OF HOCHST-ON-THE-MAIN, GERMANY, ASSIGNOR TO FARBWERKE VORM. MEISTEB LUCIUS & BR'U'NING, 0F HOCHST-ON-THE-MAIN, GERMANY, A

CORPORATION OF GERMANY.

1,082,719. In Drawing.

Specification of Letters Patent.

Patented Dec. 30, 1913;

Application filed June 14, 1910. Serial No. 506,817.

To all whom it may concern Be it known that I, HERMANN WAGNER, Ph. D., chemist, a citizen of the Empire of Germany, residing at HtSchst-on-the-Main, Germany, have invented certain new and useful Improvements in New Mon'oazo Dyestuffs and Processes of Making Same, of which the following is a specification.

I have found that valuable yellow monoazo-pigment dyestufis can beobtained by combining a diazotized monoor dinitramin of the benzeneor naphthalene series, or' a substitution product thereof, with acetoacetic anilid. The combination may occur in presence or absence of a substratum, but it is preferable to use a substratum, as this efiects a better distribution of the dyestufl'. In this process the following nitramins may. for instance, be used: The orthoand the para-nitranilin, the chloronitranilins, the dinitranilins, the dichloronitranilins, the nitrotoluidins, the chloronitrotoluidins, the nitroanisidins, the chloronitroa-nisidins, the nitrophenetidins, the nitroxylidins, the nitrocumidins and the nitronaphthylamins.

The new dyestufls are distinguished by a remarkably pure yellow tint and at the same time by excellent fastness to light and good insolubility in oil, alcohol and Water. They have the general formula HN-=N RN0z NH-b Hs I wherein R means an aryl residue. When 'mixed with a substratum they constitute a valuable color-lake which, owing to the excellent fastness of the dyestufl' is particularly suitable for oiland lime colorings, and also for printing purposes.

Example I: A diazo solution, produced in the usual manner from 13.8 kg. of paranitranilin is combined in the cold with an aqueous solution of 17.8 kg. of acetoacetic anilid dissolved with aid of 13 kg. of caustlc soda li e of 40 B. In order to facilitate the reaction it is advantageous to add to the mixture the quantity of sodium acetate necessary for suppressing the reaction of the mmeral acid. The dyestufi' thus formed has a bright yellow color and melts at about 210 (1.; ln'concentrated sulfuric acid it dissolves to a dark yellow solution. Example II: Adiazo solution, produced 1n the usual manner from 15.2 kg. of metanitro-para-toluidin, is combined in the cold with an aqueous solution of 17.8 kg. of acetoacetic anilid dissolved with aid of 13 kg. of caustic soda lye of 40 B. In order to faclhtate the reaction it is advantageous to add to the mixture the quantity of sodium acetate'necessary for suppressing the react1on of the mineral acid.- The dyestufl' thus formed has a bright yellow color and melts at about 250 0.; in concentrated sulfuric acid it dissolves to a yellow-solution.

The monoazo dyestufl produced from m-nitro-para-toluidin has the formula:

o ('7-H-N-N- on,

=0 NH-CaH The analogous combination of ortho-nitranilin has a pure lemon color and melts at about 200 0.

Having now described my invention what I clalm is:

1. The herein-described process of manufacturing yellow monoazo dyestufi's, insoluble in water, which consists in combining with acetoacetic anilid the diazo compound of a nitroarylamin.

2. The herein-described process of manufacturing yellow monoazo dyestuffs, insoluble in water, which consists in combining with acetoacetic anilid the diazo compound of a nitroarylamin, the combination occurring in presence of a substratum.-

3. As new products, monoazo dyestufl's of the formula.-

wherein R means an aryl residue being pure yellow bodies, insoluble in water, oil firm; alcohol, and possessing great fastness to ig t.

4. As a new product, the monoazo dyestuif of the formula:

Eli-C5115 N02 CONE-R1, wherein R means a substituted aryl residue and R, a substltuent, said dyestuffs being insoluble in water, possessing great fastness to light, and furnishing valuable color-lakes.

6. As new products, yellow dyestufis of the formula: t

doNH-R, wherein R and R mean aryl residues, said dyestufis being insoluble in water, possessing great fastness to light, andfurnishing valuable color-lakes.

In testimony whereof, I aflix my signature in presence of two witnesses.

HERMANN' WAGNER. \Vitnesses:

JEAN GRUND, CARL GRUN1 

